Intrinsic and Oscillated Astrophysical Neutrino Flavor Ratios Revisited
Abstract
The pp interactions taking place in the cosmos around us are a source of the astrophysical neutrinos of all the three flavors. In these interactions, the electron and the muon neutrinos mainly come from the production and the decay of the π± mesons, whereas the tau neutrinos mainly come from the production and the decay of the D±S mesons. We estimate the three intrinsic neutrino flavor ratios for 1 GeV ≤E≤1012 GeV in the pp interactions and found them to be 1:2:3×10-5. We study the effects of neutrino oscillations on these intrinsic ratios. We point out that the three ratios become 1:1:1 if L(pc)/E(GeV)≥10-10 in the presence of neutrino oscillations, where L is the distance to the astrophysical neutrino source in units of parsecs.
- Publication:
-
Modern Physics Letters A
- Pub Date:
- 2006
- DOI:
- 10.1142/S021773230602038X
- arXiv:
- arXiv:hep-ph/0505017
- Bibcode:
- 2006MPLA...21.1049A
- Keywords:
-
- 14.60.Lm;
- 14.60.Pq;
- 98.70.Sa;
- 13.15.+g;
- Ordinary neutrinos (nuW bosons;
- Neutrino mass and mixing;
- Cosmic rays;
- Neutrino interactions;
- High Energy Physics - Phenomenology;
- Astrophysics;
- High Energy Physics - Experiment
- E-Print:
- 23 pages, 5 figures, typos corrected, appeared in Mod. Phys. Lett. A